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// Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cryptotest
import (
"crypto/internal/boring"
"crypto/internal/impl"
"internal/goarch"
"internal/goos"
"internal/testenv"
"strings"
"testing"
)
// TestAllImplementations runs the provided test function with each available
// implementation of the package registered with crypto/internal/impl. If there
// are no alternative implementations for pkg, f is invoked directly once.
func TestAllImplementations(t *testing.T, pkg string, f func(t *testing.T)) {
// BoringCrypto bypasses the multiple Go implementations.
if boring.Enabled {
f(t)
return
}
impls := impl.List(pkg)
if len(impls) == 0 {
f(t)
return
}
t.Cleanup(func() { impl.Reset(pkg) })
for _, name := range impls {
if available := impl.Select(pkg, name); available {
t.Run(name, f)
} else {
t.Run(name, func(t *testing.T) {
// Report an error if we're on the most capable builder for the
// architecture and the builder can't test this implementation.
if flagshipBuilder() {
t.Error("builder doesn't support CPU features needed to test this implementation")
} else {
t.Skip("implementation not supported")
}
})
}
}
// Test the generic implementation.
impl.Select(pkg, "")
t.Run("Base", f)
}
func flagshipBuilder() bool {
builder := testenv.Builder()
if builder == "" {
return false
}
switch goarch.GOARCH {
case "amd64":
return strings.Contains(builder, "_avx512")
case "arm64":
// Apple M chips support everything we use.
return goos.GOOS == "darwin"
default:
// Presumably the Linux builders are the most capable.
return goos.GOOS == "linux"
}
}
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